drivers/net/ipvlan/ipvlan_core.c

   1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License as
   5  * published by the Free Software Foundation; either version 2 of
   6  * the License, or (at your option) any later version.
   7  *
   8  */
   9
  10 #include "ipvlan.h"
  11
  12 static u32 ipvlan_jhash_secret __read_mostly;
  13
  14 void ipvlan_init_secret(void)
  15 {
  16         net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
  17 }
  18
  19 static void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
  20                             unsigned int len, bool success, bool mcast)
  21 {
  22         if (!ipvlan)
  23                 return;
  24
  25         if (likely(success)) {
  26                 struct ipvl_pcpu_stats *pcptr;
  27
  28                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
  29                 u64_stats_update_begin(&pcptr->syncp);
  30                 pcptr->rx_pkts++;
  31                 pcptr->rx_bytes += len;
  32                 if (mcast)
  33                         pcptr->rx_mcast++;
  34                 u64_stats_update_end(&pcptr->syncp);
  35         } else {
  36                 this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
  37         }
  38 }
  39
  40 static u8 ipvlan_get_v6_hash(const void *iaddr)
  41 {
  42         const struct in6_addr *ip6_addr = iaddr;
  43
  44         return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
  45                IPVLAN_HASH_MASK;
  46 }
  47
  48 static u8 ipvlan_get_v4_hash(const void *iaddr)
  49 {
  50         const struct in_addr *ip4_addr = iaddr;
  51
  52         return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) &
  53                IPVLAN_HASH_MASK;
  54 }
  55
  56 static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
  57                                                const void *iaddr, bool is_v6)
  58 {
  59         struct ipvl_addr *addr;
  60         u8 hash;
  61
  62         hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
  63                ipvlan_get_v4_hash(iaddr);
  64         hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode) {
  65                 if (is_v6 && addr->atype == IPVL_IPV6 &&
  66                     ipv6_addr_equal(&addr->ip6addr, iaddr))
  67                         return addr;
  68                 else if (!is_v6 && addr->atype == IPVL_IPV4 &&
  69                          addr->ip4addr.s_addr ==
  70                                 ((struct in_addr *)iaddr)->s_addr)
  71                         return addr;
  72         }
  73         return NULL;
  74 }
  75
  76 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
  77 {
  78         struct ipvl_port *port = ipvlan->port;
  79         u8 hash;
  80
  81         hash = (addr->atype == IPVL_IPV6) ?
  82                ipvlan_get_v6_hash(&addr->ip6addr) :
  83                ipvlan_get_v4_hash(&addr->ip4addr);
  84         if (hlist_unhashed(&addr->hlnode))
  85                 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
  86 }
  87
  88 void ipvlan_ht_addr_del(struct ipvl_addr *addr)
  89 {
  90         hlist_del_init_rcu(&addr->hlnode);
  91 }
  92
  93 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
  94                                    const void *iaddr, bool is_v6)
  95 {
  96         struct ipvl_addr *addr;
  97
  98         list_for_each_entry(addr, &ipvlan->addrs, anode) {
  99                 if ((is_v6 && addr->atype == IPVL_IPV6 &&
 100                     ipv6_addr_equal(&addr->ip6addr, iaddr)) ||
 101                     (!is_v6 && addr->atype == IPVL_IPV4 &&
 102                     addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr))
 103                         return addr;
 104         }
 105         return NULL;
 106 }
 107
 108 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
 109 {
 110         struct ipvl_dev *ipvlan;
 111
 112         ASSERT_RTNL();
 113
 114         list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 115                 if (ipvlan_find_addr(ipvlan, iaddr, is_v6))
 116                         return true;
 117         }
 118         return false;
 119 }
 120
 121 static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type)
 122 {
 123         void *lyr3h = NULL;
 124
 125         switch (skb->protocol) {
 126         case htons(ETH_P_ARP): {
 127                 struct arphdr *arph;
 128
 129                 if (unlikely(!pskb_may_pull(skb, sizeof(*arph))))
 130                         return NULL;
 131
 132                 arph = arp_hdr(skb);
 133                 *type = IPVL_ARP;
 134                 lyr3h = arph;
 135                 break;
 136         }
 137         case htons(ETH_P_IP): {
 138                 u32 pktlen;
 139                 struct iphdr *ip4h;
 140
 141                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
 142                         return NULL;
 143
 144                 ip4h = ip_hdr(skb);
 145                 pktlen = ntohs(ip4h->tot_len);
 146                 if (ip4h->ihl < 5 || ip4h->version != 4)
 147                         return NULL;
 148                 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
 149                         return NULL;
 150
 151                 *type = IPVL_IPV4;
 152                 lyr3h = ip4h;
 153                 break;
 154         }
 155         case htons(ETH_P_IPV6): {
 156                 struct ipv6hdr *ip6h;
 157
 158                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
 159                         return NULL;
 160
 161                 ip6h = ipv6_hdr(skb);
 162                 if (ip6h->version != 6)
 163                         return NULL;
 164
 165                 *type = IPVL_IPV6;
 166                 lyr3h = ip6h;
 167                 /* Only Neighbour Solicitation pkts need different treatment */
 168                 if (ipv6_addr_any(&ip6h->saddr) &&
 169                     ip6h->nexthdr == NEXTHDR_ICMP) {
 170                         *type = IPVL_ICMPV6;
 171                         lyr3h = ip6h + 1;
 172                 }
 173                 break;
 174         }
 175         default:
 176                 return NULL;
 177         }
 178
 179         return lyr3h;
 180 }
 181
 182 unsigned int ipvlan_mac_hash(const unsigned char *addr)
 183 {
 184         u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
 185                                ipvlan_jhash_secret);
 186
 187         return hash & IPVLAN_MAC_FILTER_MASK;
 188 }
 189
 190 void ipvlan_process_multicast(struct work_struct *work)
 191 {
 192         struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
 193         struct ethhdr *ethh;
 194         struct ipvl_dev *ipvlan;
 195         struct sk_buff *skb, *nskb;
 196         struct sk_buff_head list;
 197         unsigned int len;
 198         unsigned int mac_hash;
 199         int ret;
 200         u8 pkt_type;
 201         bool hlocal, dlocal;
 202
 203         __skb_queue_head_init(&list);
 204
 205         spin_lock_bh(&port->backlog.lock);
 206         skb_queue_splice_tail_init(&port->backlog, &list);
 207         spin_unlock_bh(&port->backlog.lock);
 208
 209         while ((skb = __skb_dequeue(&list)) != NULL) {
 210                 ethh = eth_hdr(skb);
 211                 hlocal = ether_addr_equal(ethh->h_source, port->dev->dev_addr);
 212                 mac_hash = ipvlan_mac_hash(ethh->h_dest);
 213
 214                 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
 215                         pkt_type = PACKET_BROADCAST;
 216                 else
 217                         pkt_type = PACKET_MULTICAST;
 218
 219                 dlocal = false;
 220                 rcu_read_lock();
 221                 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
 222                         if (hlocal && (ipvlan->dev == skb->dev)) {
 223                                 dlocal = true;
 224                                 continue;
 225                         }
 226                         if (!test_bit(mac_hash, ipvlan->mac_filters))
 227                                 continue;
 228
 229                         ret = NET_RX_DROP;
 230                         len = skb->len + ETH_HLEN;
 231                         nskb = skb_clone(skb, GFP_ATOMIC);
 232                         if (!nskb)
 233                                 goto acct;
 234
 235                         nskb->pkt_type = pkt_type;
 236                         nskb->dev = ipvlan->dev;
 237                         if (hlocal)
 238                                 ret = dev_forward_skb(ipvlan->dev, nskb);
 239                         else
 240                                 ret = netif_rx(nskb);
 241 acct:
 242                         ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
 243                 }
 244                 rcu_read_unlock();
 245
 246                 if (dlocal) {
 247                         /* If the packet originated here, send it out. */
 248                         skb->dev = port->dev;
 249                         skb->pkt_type = pkt_type;
 250                         dev_queue_xmit(skb);
 251                 } else {
 252                         kfree_skb(skb);
 253                 }
 254         }
 255 }
 256
 257 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
 258                             bool local)
 259 {
 260         struct ipvl_dev *ipvlan = addr->master;
 261         struct net_device *dev = ipvlan->dev;
 262         unsigned int len;
 263         rx_handler_result_t ret = RX_HANDLER_CONSUMED;
 264         bool success = false;
 265         struct sk_buff *skb = *pskb;
 266
 267         len = skb->len + ETH_HLEN;
 268         /* Only packets exchanged between two local slaves need to have
 269          * device-up check as well as skb-share check.
 270          */
 271         if (local) {
 272                 if (unlikely(!(dev->flags & IFF_UP))) {
 273                         kfree_skb(skb);
 274                         goto out;
 275                 }
 276
 277                 skb = skb_share_check(skb, GFP_ATOMIC);
 278                 if (!skb)
 279                         goto out;
 280
 281                 *pskb = skb;
 282         }
 283         skb->dev = dev;
 284
 285         if (local) {
 286                 skb->pkt_type = PACKET_HOST;
 287                 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
 288                         success = true;
 289         } else {
 290                 ret = RX_HANDLER_ANOTHER;
 291                 success = true;
 292         }
 293
 294 out:
 295         ipvlan_count_rx(ipvlan, len, success, false);
 296         return ret;
 297 }
 298
 299 static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
 300                                             void *lyr3h, int addr_type,
 301                                             bool use_dest)
 302 {
 303         struct ipvl_addr *addr = NULL;
 304
 305         if (addr_type == IPVL_IPV6) {
 306                 struct ipv6hdr *ip6h;
 307                 struct in6_addr *i6addr;
 308
 309                 ip6h = (struct ipv6hdr *)lyr3h;
 310                 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
 311                 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 312         } else if (addr_type == IPVL_ICMPV6) {
 313                 struct nd_msg *ndmh;
 314                 struct in6_addr *i6addr;
 315
 316                 /* Make sure that the NeighborSolicitation ICMPv6 packets
 317                  * are handled to avoid DAD issue.
 318                  */
 319                 ndmh = (struct nd_msg *)lyr3h;
 320                 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
 321                         i6addr = &ndmh->target;
 322                         addr = ipvlan_ht_addr_lookup(port, i6addr, true);
 323                 }
 324         } else if (addr_type == IPVL_IPV4) {
 325                 struct iphdr *ip4h;
 326                 __be32 *i4addr;
 327
 328                 ip4h = (struct iphdr *)lyr3h;
 329                 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
 330                 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
 331         } else if (addr_type == IPVL_ARP) {
 332                 struct arphdr *arph;
 333                 unsigned char *arp_ptr;
 334                 __be32 dip;
 335
 336                 arph = (struct arphdr *)lyr3h;
 337                 arp_ptr = (unsigned char *)(arph + 1);
 338                 if (use_dest)
 339                         arp_ptr += (2 * port->dev->addr_len) + 4;
 340                 else
 341                         arp_ptr += port->dev->addr_len;
 342
 343                 memcpy(&dip, arp_ptr, 4);
 344                 addr = ipvlan_ht_addr_lookup(port, &dip, false);
 345         }
 346
 347         return addr;
 348 }
 349
 350 static int ipvlan_process_v4_outbound(struct sk_buff *skb, bool xnet)
 351 {
 352         const struct iphdr *ip4h = ip_hdr(skb);
 353         struct net_device *dev = skb->dev;
 354         struct net *net = dev_net(dev);
 355         struct rtable *rt;
 356         int err, ret = NET_XMIT_DROP;
 357         struct flowi4 fl4 = {
 358                 .flowi4_oif = dev->ifindex,
 359                 .flowi4_tos = RT_TOS(ip4h->tos),
 360                 .flowi4_flags = FLOWI_FLAG_ANYSRC,
 361                 .daddr = ip4h->daddr,
 362                 .saddr = ip4h->saddr,
 363         };
 364
 365         rt = ip_route_output_flow(net, &fl4, NULL);
 366         if (IS_ERR(rt))
 367                 goto err;
 368
 369         if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
 370                 ip_rt_put(rt);
 371                 goto err;
 372         }
 373         skb_scrub_packet(skb, xnet);
 374         skb_dst_set(skb, &rt->dst);
 375         err = ip_local_out(net, skb->sk, skb);
 376         if (unlikely(net_xmit_eval(err)))
 377                 dev->stats.tx_errors++;
 378         else
 379                 ret = NET_XMIT_SUCCESS;
 380         goto out;
 381 err:
 382         dev->stats.tx_errors++;
 383         kfree_skb(skb);
 384 out:
 385         return ret;
 386 }
 387
 388 static int ipvlan_process_v6_outbound(struct sk_buff *skb, bool xnet)
 389 {
 390         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
 391         struct net_device *dev = skb->dev;
 392         struct net *net = dev_net(dev);
 393         struct dst_entry *dst;
 394         int err, ret = NET_XMIT_DROP;
 395         struct flowi6 fl6 = {
 396                 .flowi6_iif = dev->ifindex,
 397                 .daddr = ip6h->daddr,
 398                 .saddr = ip6h->saddr,
 399                 .flowi6_flags = FLOWI_FLAG_ANYSRC,
 400                 .flowlabel = ip6_flowinfo(ip6h),
 401                 .flowi6_mark = skb->mark,
 402                 .flowi6_proto = ip6h->nexthdr,
 403         };
 404
 405         dst = ip6_route_output(net, NULL, &fl6);
 406         if (dst->error) {
 407                 ret = dst->error;
 408                 dst_release(dst);
 409                 goto err;
 410         }
 411         skb_scrub_packet(skb, xnet);
 412         skb_dst_set(skb, dst);
 413         err = ip6_local_out(net, skb->sk, skb);
 414         if (unlikely(net_xmit_eval(err)))
 415                 dev->stats.tx_errors++;
 416         else
 417                 ret = NET_XMIT_SUCCESS;
 418         goto out;
 419 err:
 420         dev->stats.tx_errors++;
 421         kfree_skb(skb);
 422 out:
 423         return ret;
 424 }
 425
 426 static int ipvlan_process_outbound(struct sk_buff *skb, bool xnet)
 427 {
 428         struct ethhdr *ethh = eth_hdr(skb);
 429         int ret = NET_XMIT_DROP;
 430
 431         /* In this mode we dont care about multicast and broadcast traffic */
 432         if (is_multicast_ether_addr(ethh->h_dest)) {
 433                 pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
 434                                     ntohs(skb->protocol));
 435                 kfree_skb(skb);
 436                 goto out;
 437         }
 438
 439         /* The ipvlan is a pseudo-L2 device, so the packets that we receive
 440          * will have L2; which need to discarded and processed further
 441          * in the net-ns of the main-device.
 442          */
 443         if (skb_mac_header_was_set(skb)) {
 444                 skb_pull(skb, sizeof(*ethh));
 445                 skb->mac_header = (typeof(skb->mac_header))~0U;
 446                 skb_reset_network_header(skb);
 447         }
 448
 449         if (skb->protocol == htons(ETH_P_IPV6))
 450                 ret = ipvlan_process_v6_outbound(skb, xnet);
 451         else if (skb->protocol == htons(ETH_P_IP))
 452                 ret = ipvlan_process_v4_outbound(skb, xnet);
 453         else {
 454                 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
 455                                     ntohs(skb->protocol));
 456                 kfree_skb(skb);
 457         }
 458 out:
 459         return ret;
 460 }
 461
 462 static void ipvlan_multicast_enqueue(struct ipvl_port *port,
 463                                      struct sk_buff *skb)
 464 {
 465         if (skb->protocol == htons(ETH_P_PAUSE)) {
 466                 kfree_skb(skb);
 467                 return;
 468         }
 469
 470         spin_lock(&port->backlog.lock);
 471         if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
 472                 __skb_queue_tail(&port->backlog, skb);
 473                 spin_unlock(&port->backlog.lock);
 474                 schedule_work(&port->wq);
 475         } else {
 476                 spin_unlock(&port->backlog.lock);
 477                 atomic_long_inc(&skb->dev->rx_dropped);
 478                 kfree_skb(skb);
 479         }
 480 }
 481
 482 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
 483 {
 484         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 485         void *lyr3h;
 486         struct ipvl_addr *addr;
 487         int addr_type;
 488         bool xnet;
 489
 490         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 491         if (!lyr3h)
 492                 goto out;
 493
 494         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 495         if (addr)
 496                 return ipvlan_rcv_frame(addr, &skb, true);
 497
 498 out:
 499         xnet = !net_eq(dev_net(skb->dev), dev_net(ipvlan->phy_dev));
 500         skb->dev = ipvlan->phy_dev;
 501         return ipvlan_process_outbound(skb, xnet);
 502 }
 503
 504 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
 505 {
 506         const struct ipvl_dev *ipvlan = netdev_priv(dev);
 507         struct ethhdr *eth = eth_hdr(skb);
 508         struct ipvl_addr *addr;
 509         void *lyr3h;
 510         int addr_type;
 511
 512         if (ether_addr_equal(eth->h_dest, eth->h_source)) {
 513                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 514                 if (lyr3h) {
 515                         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
 516                         if (addr)
 517                                 return ipvlan_rcv_frame(addr, &skb, true);
 518                 }
 519                 skb = skb_share_check(skb, GFP_ATOMIC);
 520                 if (!skb)
 521                         return NET_XMIT_DROP;
 522
 523                 /* Packet definitely does not belong to any of the
 524                  * virtual devices, but the dest is local. So forward
 525                  * the skb for the main-dev. At the RX side we just return
 526                  * RX_PASS for it to be processed further on the stack.
 527                  */
 528                 return dev_forward_skb(ipvlan->phy_dev, skb);
 529
 530         } else if (is_multicast_ether_addr(eth->h_dest)) {
 531                 ipvlan_multicast_enqueue(ipvlan->port, skb);
 532                 return NET_XMIT_SUCCESS;
 533         }
 534
 535         skb->dev = ipvlan->phy_dev;
 536         return dev_queue_xmit(skb);
 537 }
 538
 539 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 540 {
 541         struct ipvl_dev *ipvlan = netdev_priv(dev);
 542         struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
 543
 544         if (!port)
 545                 goto out;
 546
 547         if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
 548                 goto out;
 549
 550         switch(port->mode) {
 551         case IPVLAN_MODE_L2:
 552                 return ipvlan_xmit_mode_l2(skb, dev);
 553         case IPVLAN_MODE_L3:
 554                 return ipvlan_xmit_mode_l3(skb, dev);
 555         }
 556
 557         /* Should not reach here */
 558         WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
 559                           port->mode);
 560 out:
 561         kfree_skb(skb);
 562         return NET_XMIT_DROP;
 563 }
 564
 565 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
 566 {
 567         struct ethhdr *eth = eth_hdr(skb);
 568         struct ipvl_addr *addr;
 569         void *lyr3h;
 570         int addr_type;
 571
 572         if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
 573                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 574                 if (!lyr3h)
 575                         return true;
 576
 577                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
 578                 if (addr)
 579                         return false;
 580         }
 581
 582         return true;
 583 }
 584
 585 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
 586                                                  struct ipvl_port *port)
 587 {
 588         void *lyr3h;
 589         int addr_type;
 590         struct ipvl_addr *addr;
 591         struct sk_buff *skb = *pskb;
 592         rx_handler_result_t ret = RX_HANDLER_PASS;
 593
 594         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 595         if (!lyr3h)
 596                 goto out;
 597
 598         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 599         if (addr)
 600                 ret = ipvlan_rcv_frame(addr, pskb, false);
 601
 602 out:
 603         return ret;
 604 }
 605
 606 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
 607                                                  struct ipvl_port *port)
 608 {
 609         struct sk_buff *skb = *pskb;
 610         struct ethhdr *eth = eth_hdr(skb);
 611         rx_handler_result_t ret = RX_HANDLER_PASS;
 612         void *lyr3h;
 613         int addr_type;
 614
 615         if (is_multicast_ether_addr(eth->h_dest)) {
 616                 if (ipvlan_external_frame(skb, port)) {
 617                         struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
 618
 619                         /* External frames are queued for device local
 620                          * distribution, but a copy is given to master
 621                          * straight away to avoid sending duplicates later
 622                          * when work-queue processes this frame. This is
 623                          * achieved by returning RX_HANDLER_PASS.
 624                          */
 625                         if (nskb)
 626                                 ipvlan_multicast_enqueue(port, nskb);
 627                 }
 628         } else {
 629                 struct ipvl_addr *addr;
 630
 631                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
 632                 if (!lyr3h)
 633                         return ret;
 634
 635                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
 636                 if (addr)
 637                         ret = ipvlan_rcv_frame(addr, pskb, false);
 638         }
 639
 640         return ret;
 641 }
 642
 643 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
 644 {
 645         struct sk_buff *skb = *pskb;
 646         struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
 647
 648         if (!port)
 649                 return RX_HANDLER_PASS;
 650
 651         switch (port->mode) {
 652         case IPVLAN_MODE_L2:
 653                 return ipvlan_handle_mode_l2(pskb, port);
 654         case IPVLAN_MODE_L3:
 655                 return ipvlan_handle_mode_l3(pskb, port);
 656         }
 657
 658         /* Should not reach here */
 659         WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
 660                           port->mode);
 661         kfree_skb(skb);
 662         return RX_HANDLER_CONSUMED;
 663 }